Heating unit for ovens



1,478,363 W.y F. SCHALLER HEATING UNIT FOR OVENS Filed March 24. 1921 3 Sheets-Sheet 1 INVENTOR. WFJCIQZer f Dec5 18 1923.

Dec. 18, 1923.

Donno/0000 ooooooooo 1,478,363 w. F. scHALLER HEATING UNIT FOR OYENS Filed March 24. 1921 3 Sheets-Sheet l2 IN VEN TORv ATTO EY.

Dec. 18 1923.

W. F. SCHALLER HEATING UNIT FOR ovENs 'Filed March 24.

1921 3 Sheets-Sheet 5 INVENTOR. l WZ/TJca/Zer.

i .9%. 2v RQ S QQ MQ w QQ Nmwlhhi Patented lilies. 18, 1923.

WMM F. SCHALLER, .SAN FRANCKSCU. CALIFGRND.

HEATING UNIT FOB OVENS.

Application :sled larok 24, 192i.

To all 'whom t may concern.:

Be it known that l, WVILLIAM F. SCHALLEB, a citizen` of the United States, residing at San Francisco, in the county of San F rancisco, State of California, have-invented a new and. useful Heating Unit for Ovens, of which `the following is a specilcation, in such 4full and clear terms as 'will enable those skilled in the art to construct and use the sance. y

This invention relates to an oven heating unit and the object of the invention is to provide means whereby the heating unit may be removed from the oven without completely dismantling the same and without removing the endless belt from the oven: the belt simply being raised high enough abovefthe bottom portion of the heating unit to allow the same to be removed bodily and a new heating unit thereafter inserted in place.

Another object of the invention is to provide means whereby the heating unit with itself carries the rollers for supporting the endless carrier, thereby enabling the rollers to be removed with the heating unit whenever 'that becomes necessary.

Another object of the invention is to provide a heating unit with heating coils both above and below the endless carrier thereby more uniformly heating the material placed upon 'the carrier.

@ther objects of the invention will appear as the description proceeds.

An embodiment'ofA the invention is shown in the accompanying drawings in which the same reference vnumeral is ap lied to the saine portion throughout but am aware that there may be modifications thereof.

Fig. l is a sectional view of one of the heating Fig. 2 is a sectional view of one ofthe hea-'ting units looking at right angles to Fig-- ure 1.

Fig. 3 is a sectional view showing the ends of one of the rollers.

Figli is a view of a portion of the heating unit showing the means for disconnecting the top portion from the lower portion.

Fig. 5 is a longitudinal sectional View of an oven having this heating 'unit applied thereto. y

Fig. 6 is a plan view of the oven shown in Fig. 5.

`nig.. 7 is a sectional view ci a inodiiied form of heating unit in which the heating coils are all helo'w 'the endless carrier and Serial 1i' o. 455,243.

Fig. 8 is a sectional view of the heating unit shown in Fig. '7.

The heating unit comprises a rectangular frame made up of angle steel hars l to 4 in` elusive, forming a rectangular freine to which are secured four posts 5 to 8 inclusive.

At each corner of the traine 4there is an L shaped plate 9 which is suitably bolted to the rectangular traine formed by the bars l to 4.- inclusive and which forms the hase to which the four castor wheels l0 are connected.

The comer posts rest upon the horizontal portion of the plate 9 at one edge, and the insulating strips l2 and l also rest u on the horizontal portion of said plate. etween the insulating strips l2 and 13 there are plurality of other insulating strips 14 precisely the saine as insulating strips 12 and 13 and they are supported in pairs hy U shaped 4brackets l5 which are connected to the ends of the insulating strips and to the angle on bars l and 2. Connecting, the angles i and 2 and secured thereto are a plurality of steel angles,v 16 to 2l which ktorni the supports for rods 22 and 23 which carry the rollers 9A to 27 inclusive, over which rollers the two endless helts 28 and 29 travel. Y Each roller has a pressed metallic cup 30 at each end into which cup is pressed a well known form of selcontained ball bearing consisting of a cone 3l, balls 32, bearing shell 233 and retainer 34, while 'bushings 35 on the shafts 2Q and 23 hold 'the rollers in 'their proper position.

At each side of the frame there are two fiat insulating strips 36 and 37 'to which the coil terminals 38 and 39 and of which there are e. considerable number may he secured. The nsulating strips 14 are provided with aligned holes through which the heating `wire il@ is passed; there coing such a. nnrnher of holes and coils as the sise of 'the heating unit demands,

The upper portion of the heating unit consists of a rectangular iron 'trarne consisting of `the sides a2, 43, lli and These sides and ends consist of a single piece bent into a rectangular, traine and connected together, said frame forming the support for a plurality of .dat insulating strips 46. The insulating strips are connected 'to the 'traine supporting 'them hy means ci* a plurality of U shaped crochets 47 in pairs, the saine as the insulating strips le in -the lower part of lthe haine.

At the sides there are 'two insulating dll Figures 7 and strips t8 and lll to which the .terminals 50, 5l and 52 are connected; there being plurality of the terminals'in each instance. tlso connected to the traine supporting the insulating members lbf are tour depending legs 5d, 55, 56 and 57 which have their ends soelreted es indicated at 58 to receive the pins li and to permit the vtop trarne to be removed from the lower carriage by ele- The oven itself is made up ol' a plu-.

rality of sections t5@ to 6ft inclusive in such numbers as may be deemed desirable. The oven has closures 65, o6 at its ends through which the endless carrier 05'? in the present instance only a single carrier being shovvn, passes. This carrier passes around drivinel drum t8 and idler drum 69 and over tvvo tighteners Z0 and 7l. rlhe sides ot the oven indicated at 72 to 76 inclusive and are removable so that the carriages can be rernoved tor inspections and repairs.

llt will be understood that the nurnber of carriages depends entirely on the capacity or the oven and the length oli the endless currier required in any given instance..

Also it vvill be understood that one belt ertvvo belts may be used in connection 'with the carriages. ln the present instance the carriages are indicated at A, ll, C und l.

lln the :torni ol? the invention shown in il there are a plurality el insulating strips tl@ which are supported by a rectangular angle traine having the sides 8l to inclusive. The insulating strips are connected to the angle iron trarne in pairs with ll shaped braclrets 85 substentially the saine as in the previous forni ot the invention, and atV the sides o'l the Jtrame there. are two horizontal entendingn insulating strips 86, 8i' to which the terminals 88, 89 and 90 in suitable nurnbei are secured., yll`he depending strips have a plurality ot holes in alignment for the .plurality oi coils 9i.

At each corner ot the trarne there is an L shaped plate 92 which plate is connected to the rectangular trarne and terms the support to which the castors 93 are connected. ./'llso connected to the traine are tour posts 9d to lli? inclusive, which posts are also connected to the l. shaped plates 92. 'llhe trame also has four tingle. bars lltl to 101 inclusive, which angle bars torni the support for a plurelity ot shafts i025. carrying the rollers 103 ot which the present trarne has 18.

ln connection with this heating unit there is shown a common torno ot endless carrier chain consisting ot a plurality' of links; the chain being arranged in three runs as shown at 105, l0@ and l0?, and conn nected together by the rod l07 passing through the chain flights l0@ to llt inclusive.

The lorrn ot carrier and heating units shown in Figures l to el inclusive is intended for use with crackers and cakes where bot-h sides ot material are to be .quiolrly and evenly baked, and which cakes may be placed directly upon the carrier upon sheets ol paper or upon Wide shallow pans.

ln the torni ot the invention shown in Figures l and 8 the number ot rollers used is sufficiently large in connection With each heating unit to permit the use ot pans which extend over about four rollers 1n width.

What l'clairn is as follows, but various inodiications may be made in the construction shovvn in the drawings and above particularly described torni, Within the purview ot' iny invention.

l. l'tn oven heating unit comprising a mov able carriage, a plurality ol insulating plates carried thereby, a plurality ot heating elements supported by the insulating plates,

and a roller on the carriage tor the supportv ol a movable door.

2.. oven heating unit comprising a nuovable carriage, a plurality ot insulated plates carried thereby, a plurality ot heatingh elernents supported by said plates, and a roller above the heating units lor the support of a movable door.

3. ln'oven heating unit comprising a Inovable carriage, a plurality ol insulated plates carried thereby, a plurality ol electric heating units supported by said plates, and roll.- ers on the carriage :tor the support ol an endless door.

Ll. flu oven heating unit comprising a movable carriage, a plurality ot insulated plates carried thereby, a plurality ol electric heatine' units supported by the plates, and rollers tor the support or an endless door, the heating elements being positioned above and below said rollers.

5.' An oven heating unit comprisinp7 a movable carriage, a plurality ot insulated plates carried thereby, rollers supported .on the earrings between the insulated pletes to support a movable floor, and ball bearings for the several rollers.

lin testimony vvhereo'l l have hereunto set niy hand this llth dey ol ll/larchJl.. l). lllQl. l

lll@

lllli 

